Material drier



M, MADSEN MATERIAL DRIER June 4, I92 9.

Filed 0 11, 1926 r {N VENTOR @WJW M A TOR/VB Y Patented June 4, 1929. v

UNITED STATES PATENT OFFICE.

MARTIN MADSEN, OF MONTEREY PARK, CALIFORNIA, ASSIGNOR TO MADSEN IRONWORKS, OF HUNTINGTON PARK, CALIFORNIA, A CORPORATION OF CALIFORNIA.

MATERIAL DRIER. L

Application filed October 11, 1926. Serial No. 140,808.

6 My invention relates to driers for drying paving and other material inwhich liquid hydrocarbon or gaseous fuel is used and the object thereofis to produce an efiicient drier in the use of which the objectionabledust usually lost in the air and attendant on drying paving materialshall be reduced to a mmimum; I v

In the drawings forming a part of this application, Fig.1 is afragmentary side elevation, partly in section of my improved sand drier.Fig. 2 is a front elevation of so much of the drier as illustrates myinvention.

In a suitable frame 5, a portion of which is shown in the drawings, ismounted the revolving drying drum 6 in the rear end of which is receivedthe feed hopper 7 into Surrounding the front end of drum 6 and spacedtherefrom is cowl 12 in the front end of which are the air regulatingand inspection doors 13 and 14. These doors are mounted to slide intracks 15 and 16 and close an opening in the front of the cowl shown inFig. 2 by dotted line 17. A suitable burner 18 projects into the cdwlthrough the center of the doors. Burner 18 is supplied with liquidhydrocarbon fuel or gaseous fuel through pipe 19 from a supply not shownand with steam or compressed air from a supply not shown throughpipe 20.

Within the cowl and projecting into the end of drum 6 is fire box whichis lined with fire brick 22. A dust plate 23 has a flange '24 securedthereto which flange projects into the drier 6 in close proximitythereto.

At'or near the ends'of drum 6 are track rings 25 which run upon rollers26. Only one track ring is shown, the other being on.

the broken out portion. A stack 27 is connected to the end of drum 6nearest the hopper 7. On the interior of drum 6 are sc curedlongitudinal ledges 28, as the drum re- .volves carries the material upand drops it.

Paving material that is to be dried is fed into hopper 7 in regulatedquantities and slides down into drum 6 which is caused to rotate bysuitable power applied to shaft 11. At the same time fuel fed by burner18 is lighted. The heat soon heats up the walls of drum 6 and as itslowly rotates, the. materialpassingthrough the drum is caught by ledges28 and carried up and dropped through the products of combustion. Theair to supply combustion passes into the cowl around the fire box sothat the dust produced by drying the material is prevented by the aircurrent from coming out of the front end of the drier. By the time thematerial reaches spout 8 it is thoroughly dried and heated and in propercondition for mix ing with the other paving material. Ledges 28 could beomitted but I prefer theiruse as the material drys faster when they areused. By adjusting doors 13 and 14 a regulated pressure of air ismaintained in drum 6.

Having described my invention, I claim: A material drier comprising aframe; a drum revolubly mounted in said frame; a stack mounted in saidframe and connected to one end of said drum; a hopper mounted on saidframe and discharging into the drum; a cowl surrounding the other end ofsaid drum; a fire box secured to said cowl having open ends, one endprojecting into the drum and the other end spaced from the cowl .adischarge chute secured to said cowl;

and a burner projecting into the end of the cowl.

In witness that I claim the foregoing I have hereunto subscribed my namethis 4th day of October, 1926.

MARTIN MADSEN.

